Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu sach » chieu sach, hieu cach, dien sach
tran dung » tran dang, tran quang, trung dung
tran hung » tran hong, tran quang, tran hoang
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san van » tan van, luan van, tran van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu sach - thanh trung ((tran dung) or (tran hung)) cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh trung ((tran dung) OR (tran hung)) cong san van ban*.